Question about 2005 Mercury Monterey
Sounds like vent actuator under dash on drivers side needs to be replaced. Your problem sounds like the common blend door problem on the Fords. The door is on a vertical axis and when it breaks, it can swing back and forth randomly giving heat or AC or nothing. The difference on acceleration is the force placed on the door swinging it one direction.
You can check the operation by fully, removing the actuator motor on top of the plenum box and examining the blend door axle. Pictures of the common fail signature are available on the heatertreater.net web site. There are several "free" fixes that mostly are worth what you pay for them. The solution on the web site is solid and proven over hundreds of vehicles and will resolve the problem once and for all.
Good luck my friend.
Posted on Aug 04, 2009
Most Likley The Part below
Electronic Automatic Temperature Control (EATC) Module
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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